I don’t text unless I want to hangout, and if there isn’t enough interest for her to want to hangout and meet up, especially after 4 dates/mini-dates, it has more to do with how she perceives your value/fun/attractiveness. If that is the case, it is higher priority to work on fixing those things, then turning a girl who is neutral with you into attracted, better to move on to the next one.
Also would reccomend inviting her out to do fun things and showing off your lifestyle/what life is like with you over going for walks. Very hard to build attraction on walks/non-sexually charged environment.
I virtually always invite girls to “come out” with me, rather than a date. Something like “yo, going to (concert, event, bar, etc with some friends this weekend. Come out!). Its way less pressure, showcases that you have stuff going on in your life without her being a focal point, as girls are usually concerned with a guy catching oneniteous and getting obsessive and weird after one date. Also if she says no, it’s not like she rejected you, and then you go out and have fun anyways, and to really dig it in im posting videos/etc of the night on my social media, having a blast anyways that further will build the mystery and lack of neediness.
If none of that is a possibility yet due to social circle constraints, focusing your time on building a fun and exciting life will have a much greater RoI then chasing girls. That’s when the wanted titles really work there magic.