@kiranmk2 There's still the availability of uBlock Origin for macOS Mojave and Safari (even the latest Technology Preview of Safari from a few days ago) - go here,
https://github.com/el1t/uBlock-Safari/releases and drag the downloaded(latest release) file over the Safari icon in the Dock and install - accept the popup following the first initial complaint from Safari and allow installation from the Extension Gallery and you're off. Safari will complain to no end(in Preferences) of course with it being the cause of slow downs whilst surfing the Web.
The above is done a few minutes ago to test a solution to the issue of a content blocker for Safari. And while using the latest Technology Preview of Safari.
Also - seeing that you mention all other tracker blockers than uBlock Origin I'm now uncertain if that meets your criteria. 1Blocker is one blocker I also use but it's a weird program for when whitelisting a website. The whitelisting only takes place when the 1Blocker.app is opened and not only when using the extension - in my experience. I'm quite pleased that uBlock Origin works.
uBlock Origin is an ad-blocker but I guess also blocker for tracking around the web.
And to OP - I have no issues with Safari - I have been back and forth with Firefox but it has many quirks that I can't unsee. Like the contextual menu - it's the worst; on a dark interface this is still white and the menu itself is a weird combo of blur and it appears that the menu seperators are too tall? - looks dreadful. The solution is to use shadowfox and use a dark theme all the time which is also tiresome. Shadowfox is to viewed here
https://github.com/overdodactyl/ShadowFox
Firefox has generally been a bad citizen on macOS with their messed up interface. The browser itself is hella good and boasts many features over Safari. I like that about Firefox. In turn I like that Safari has the interface down as it obviously should have. The experience of surfing the Web is a pleasure on both browsers. Both equally speedy. I get where I need to go in time.