Meet more people instead of fixating on one: chemistry cannot be predicted before you meet
In two speed-dating studies, participants completed more than 100 measures before meeting. These could predict who generally liked others and who was generally popular, but not whether two particular people would click. You have to meet to find that out. Meeting more people makes better use of your time than staking everything on one.
What it takes
Free. Spend time meeting several people instead of repeatedly analyzing one person. Resisting fixation is the hard part.
What you may gain
Participants in two speed-dating studies completed more than 100 self-report measures related to partner preferences before meeting. Researchers used random forests, an algorithm for finding patterns. The measures explained 4%–18% of the variance in a person's general tendency to desire others, and 7%–27% in how desirable that person was to others. Variance means differences between people; the questionnaires explained only part of those differences. No combination of pre-meeting traits and preferences predicted desire between two specific people. An earlier speed-dating experiment by the same researchers also found that participants' stated preferences, such as valuing looks or earning prospects, did not predict their interest in particular people they met.
Context & considerations
These studies show that attraction could not be predicted before meeting, not that effort is useless. Give several people a real opportunity to meet you instead of betting everything on one. Participants were Western university students; China's dating environment differs, so discount direct application to your own circumstances.
Research & references
Joel S, Eastwick PW, Finkel EJ (2017). Is romantic desire predictable? Machine learning applied to initial romantic attraction. Psychological Science, 28(10), 1478-1489. https://doi.org/10.1177/0956797617714580; Eastwick PW, Finkel EJ (2008). Sex differences in mate preferences revisited: do people know what they initially desire in a romantic partner? Journal of Personality and Social Psychology, 94(2), 245-264. https://doi.org/10.1037/0022-3514.94.2.245