A big yearly number is hard to act on. Turn it into a weekly to-do: how many proposals to send.
Projects needed = goal ÷ average project value. Proposals needed = projects ÷ win rate. The result tells you how much sales activity your goal really requires.
The three levers are the average project value, your win rate and repeat business. Improving any of them lowers the number of new clients you have to find.
It depends heavily on how warm the leads are. Referrals and repeat clients convert far better than cold job-board proposals. Track your own rate over a few months.
Use revenue before tax and expenses here. Use the hourly rate calculator to work out what revenue gives you the take-home pay you want.