Do I really need 50 conversion events in a 7 day period for my ad to learn the best targeting?

It’s a small painting business and I’m currently doing messaging conversions.

I’m paying on average $20-$25 per message. In order to get 50 conversions in a week I would need an ad budget of $1250 a week which is simply not in the cards now or in the distant future.

Can it just get 50 events eventually?

Also, will my ad eventually get smarter and the cost per message become lower? My current ad which has done the best I’ve spent $130 on and gotten 6 messages. I’m really hoping my ad gets smarter and that cost per message comes down. Especially since half the messages are utterly useless and not leads at all.