I've run my own personal email for around 20 years at this point using the same IP address, and have set up all the bells and whistles (SPF, DKIM) over the year

I've run my own personal email for around 20 years at this point using the same IP address, and have set up all the bells and whistles (SPF, DKIM) over the years as they became in vogue. To my knowledge, I haven't had any issues with getting caught up in Google's or MS's spam filters, but I have to wonder if that's simply because I don't send a lot of messages and for the most part reply to emails rather than being the initiator of a conversation.