Block proposal frequency
How often a validator receives block proposals, and is selected to be part of a sync committee, is entirely random. As long as you do not see missed proposals, there is absolutely nothing you can do to increase the frequency.
True randomness can feel quite odd. A validator not getting a proposal for 9 months is perfectly normal. A validator getting two proposals in a week is entirely normal. Over a large enough set, this evens out, but for a handful of validators, randomness can indeed feel unsettling.
The tool ethdo ↗ by attestant.io ↗ can be used to query the current average frequency of proposals and sync committees. As of late 2022, it is roughly one proposal every 2 months and sync committee participation every 2.5 years.
We like to joke that burning some Vitalik prayer candles ↗ may increase your chances. But no, seriously, it's random. There is nothing you can do to increase your chances at proposals, short of running more validators.