The solution is to run your own instance, create a few accounts for it to use and put it behind a reverse proxy with basic auth. Hand out logins to a few people and it will remain useable. If you put your instance out in the open it will sooner or later end up temporarily blocked - I tried this for a few years, same results every time - but smaller instances remain useable.

It isn't hard to run an instance, just park it next to your SearXNG [1], Invidious [2], Redlib [3],PeerTube, ... instances.

[1] https://github.com/searxng/searxng

[2] https://github.com/iv-org/invidious

[3] https://github.com/redlib-org/redlib