The fewer people you actively focus on, the more you can do for each; keep everyone in your database and let software watch the rest.
The idea
We're conditioned to believe more is better: more contacts, more tasks, more coffees. More usually leads to overwhelm. We'll meet around 10,000 people in a lifetime and can hold about 150 in our heads at once (Dunbar's number). So proactively engage the people above your threshold of importance, keep a full database of everyone else, and let software keep tabs on them. The tighter that focus, the more you can actually do for the people in it.
How to do it
Look at your active outreach list. Do all of these people need to be on it?
Move anyone you aren't excited to engage with off the proactive list. Leave them in the database; you'll still answer their email.
Split big groups into higher and lower priority.
Stretch cadences where nothing is urgent. Going from every 30 days to every 45 cuts the work by a third, and they likely won't notice.
Example
Run the math on my own world. I've interacted with upward of 3,000 people across email, contacts and social. Keep up with all of them monthly and that's 100 people a day, before anyone replies. If a yearly half-hour coffee were the best way to build each relationship, that's 3,000 coffees a year, or 8.2 a day, at which point the barista should ask if I'm OK. In my coaching the whole instruction was "Addition by subtraction. That's it." Remove people so you can focus on the rest.
Watch out for
Subtraction applies to your routines too. If you can't find time for relationships, cutting something from your day beats adding to it.
Match Investment to Tier: Every touch costs different time and money, so spend dinners and gifts on your top tier and lighter touches on larger groups.