My plan is to go with the flow. No one can tell what the future holds. I'm still tentatively planning to save a quarter of my salary for investment. It was one-third before, and I don't think the market is any different from last year. I think in addition to investing in Bitcoin, I will choose to invest more in gold.
Proposing to invest a part of your salary is a good idea, but I think a fixed amount is not necessary, vary it as per the market price of bitcoin while keeping a fixed ceiling of the max investment value. Not every month will have bitcoin at the good buying points so you might not invest even a single penny.
Gold is a good investment too, it has its own pros and cons and one must diversify into different asset classes to get the maximum output from the portfolio. In crypto keep yourself limited to bitcoin, a new year will never bring good news for any altcoin but only lows and more lows.
Keep tabs on every investment sector. For those of us who are in the long term game, we need to be at the front with every one of them.