Gmail and Yahoo is the regulator of all promotional and marketing emails. After this February 2024 then all your emails will land in spam.
After February 2024, all your emails will go to spam due to the new compliance policy of Gmail and Yahoo.
To compliance this you need to setup DMARC, DKIM And SPF in your autoresponder. But its need lot of Technical Skills and time.
So, its high time for your to take action and move on to the Done For You Solution.