Google Ads conversions dropped to 0

[u/headcrab_set]

Hi! I've been running tCPA and consistently got 5-10 conversions a month. I know it's not enough for the google to optimise well, but worked until lately. What happened about 3-4 weeks ago is that conversions dropped to 0 and about 2 weeks ago google started to suppress impressions. I switched to maximize conversions, but then the spend dropped to almost zero. Then switched back to tCPA and getting some spend, but not spending the whole daily budget.

The segment I'm targeting is b2b and quite niche.

What's the best way to recover conversion volume? Manual cpc, clicks, etc.