If my website is cached and I do not see improvement in my SERP is it wise to make a few minor changes to try to improve SERP? If so, what is the best strategy? Title Tag Change? KeyWord Change? Meta Description Change? Home Page Text Change? Also what is the average timescale until the next Google cache to see if my changes improved serp?
You can try to tweak things like that, but you likely won't jump up in the rankings just because of such onpage factors. Rankings are more driven by backlinks. If you have lower quality backlinks than the websites above you, changing your page title won't make a difference. Just work on building more backlinks on a regular basis. Build those links from multiple sources and keep varying the anchor text.
Cache means indexed has nothing to do with scoring of seo implementations which occurs usually once every 90 days.... play with things at your own peril....
I agree with Vansterdam. Work on linkbuildling. If you have a pretty good ranking already, I'd stay away from or minimize on-page changes.
If your website is cached, it does not mean that you will see improvement in SERPs but it may happen if your page has some quality content. moreover, there is no timescale, rather, there is nothing like timescale in SEO
if you have good title, keywords, description, home page text then you don't change it. but you just get many link from another website which have high PR. and one more thing you just use your target keywords as title in directory submissions, forum posting, article, blog, social bookmarking. that is very benefit for you. and use multiple title and description.