Whats the best Anntena can be used to enhance LTE signal

Hello,
The issue below:

  • My HUAWEI internet router automatically select the nearest sector which is very slow in internet downloading. I think it’s overused since it’s the only sector around my area. However; there are other sectors not far away but my router just select my area sector.

  • I think there is way to select other sector manually from HUAWEI router but I couldn’t find the way From my knowledge selection sector can be done by direct the anntena dish to the cell tower which is my plan to buy anntena but I want to ask first if there is way to do that throw application or writing code script in modem.
    Please advice.

And advice me whats the best anntena dish can be used for this porpose and whats the factor should I be aware in purchasing anntena. The Freqeunces of our mobile provider are below:
4g:
1800
2300
2600
2100
900
2500

3g:
2100
900
1900
850