This is NOT a good stylus and definitely NOT a good replacement stylus, at all, for an Apple Pencil.
Total garbage!
There is nothing to be done for the crummy quality and performance of this stylus.
The stylus you purchased is another type of commonplace, “active” capacitive stylii that is a fine tip/ballpoint-like tipped, battery operated, so-called “active” , non-Bluetooth stylus type that uses a tiny battery to send small electrical signals to a fine point tipped stylus that mimics an actual finger touch.
All of these types of stylii suffer from varying degrees of line wobble when drawing angular lines. Some of these “unknown, no-name” battery powered stylii wobble write/draw worse than others.
You would have been much better off with this Adonit stylus that is compatible with the 7th gen iPad and with the compatible apps listed.
The Adonit Note+
https://www.adonit.net/noteplus/
Other than Adonit stylii, which IMHO, have great quality and great functionality with all of the third party approved compatible apps.
No “off brand, “no-name”, battery powered active, battery powered stylus sold by Amazon is any good and is of low quality and poor functionality.
The only better battery operated “active’” capacitive stylii that I can fully recommend are made by Adonit/
https://www.adonit.net/dash/
All battery powered “active”, non-Bluetooth capacitive stylii will all have some degree of line wobble when drawing and writing with these stylii
All of Adonit's versions of these types of stylii show this line wobble to a much lesser extent, though.
If you already have an Apple Pencil on order and shipping, just wait for it!
If you ever need a good alternative, 2nd best stylus for your iPad, the newest Adonit Note+ is the 2nd best stylus I can honestly recommend for your 7th gen iPad.
Adonit stylii have been around for the past 6-7 years and they make great stylii for any iPad model.
Best of Luck to You!