Update the support policy section

Author: kevinchalet

README.md

@@ -102,9 +102,13 @@ You should receive a response within 24 hours. If for some reason you do not, pl
 
 ## Support policy
 
-If you need support, please first make sure you're [sponsoring the project](https://github.com/sponsors/kevinchalet).
-Depending on the tier you selected, you can open a GitHub ticket or send an email to contact@openiddict.com for private support.
-Alternatively, you can also post your question on [Gitter](https://app.gitter.im/#/room/#openiddict_openiddict-core:gitter.im).
+**If you need support, please first make sure you're [sponsoring the project](https://github.com/sponsors/kevinchalet) or are a regular contributor**:
+GitHub tickets opened by users who haven't contributed to the project or don't actively sponsor it will be automatically closed.
+
+> [!TIP]
+> Depending on the tier you selected, you can open a GitHub ticket or send an email to [contact@openiddict.com](mailto:contact@openiddict.com) for private support.
+>
+> Alternatively, you can also post your question on [Gitter](https://app.gitter.im/#/room/#openiddict_openiddict-core:gitter.im).
 
 **Support is only offered for the latest stable version of OpenIddict**. There are, however, two exceptions to this policy:
   - **ABP Framework users receive patches for OpenIddict for as long as ABP Framework itself is supported by Volosoft**
@@ -117,24 +121,27 @@ Alternatively, you can also post your question on [Gitter](https://app.gitter.im
   | 6.x (current)     | 9.x                  | Currently supported             |
 
   - **OpenIddict sponsors are offered extended support depending on the selected sponsorship tier:**
-    - $100/month sponsors get full support for the previous version 1 month following the release of a new major version.
-    - $250/month sponsors get full support for the previous version 6 months following the release of a new major version.
-    - $500/month sponsors get full support for the previous version 12 months following the release of a new major version.
-    - $1,000/month sponsors get full support for the previous version 24 months following the release of a new major version.
-
-  | OpenIddict branch | Sponsorship tier       | End of support date |
-  |-------------------|------------------------|---------------------|
-  | 4.x               | $100/month (or more)   | January 18, 2024    |
-  | 4.x               | $250/month (or more)   | June 18, 2024       |
-  | 4.x               | $500/month (or more)   | December 18, 2024   |
-  | 4.x               | $1,000/month (or more) | December 18, 2025   |
-  |                   |                        |                     |
-  | 5.x               | $100/month (or more)   | January 17, 2025    |
-  | 5.x               | $250/month (or more)   | June 17, 2025       |
-  | 5.x               | $500/month (or more)   | December 17, 2025   |
-  | 5.x               | $1,000/month (or more) | December 17, 2026   |
-  |                   |                        |                     |
-  | 6.x (current)     | Any                    | Currently supported |
+    - Tier 6 sponsors get full support for the previous version 1 month following the release of a new major version.
+    - Tier 7 sponsors get full support for the previous version 6 months following the release of a new major version.
+    - Tier 8 sponsors get full support for the previous version 12 months following the release of a new major version.
+    - Tier 9 sponsors get full support for the previous version 24 months following the release of a new major version.
+
+  | OpenIddict branch | Sponsorship tier | End of support date |
+  |-------------------|------------------|---------------------|
+  | 4.x               | Tier 6 (or more) | January 18, 2024    |
+  | 4.x               | Tier 7 (or more) | June 18, 2024       |
+  | 4.x               | Tier 8 (or more) | December 18, 2024   |
+  | 4.x               | Tier 9           | December 18, 2025   |
+  |                   |                  |                     |
+  | 5.x               | Tier 6 (or more) | January 17, 2025    |
+  | 5.x               | Tier 7 (or more) | June 17, 2025       |
+  | 5.x               | Tier 8 (or more) | December 17, 2025   |
+  | 5.x               | Tier 9           | December 17, 2026   |
+  |                   |                  |                     |
+  | 6.x (current)     | Any              | Currently supported |
+
+> [!TIP]
+> For more information on the different tiers and the benefits they offer, visit [GitHub Sponsors](https://github.com/sponsors/kevinchalet).
 
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