Alright, there is some serious confirmation bias MAGA brain cancer going on right now.
You would think that the lawyers hired by the Trump campaign would have access to the strongest evidence of this so called voter fraud. The fact is, there have been 33 court cases so far. Trump has won 2 and lost/dropped 31. The ones he won had absolutely nothing to do with voter fraud. If you want to win, you have to focus on what you are good at. Voter disenfranchisement, because that's what it is called when you can get 2,349 votes disqualified just because the voter failed to write in the date next to their signature. It wasn't anywhere close to flipping the state of PA where Biden leads by over 80,000 votes, but every vote deserves to be counted.
While there have been some cases filed citing voter fraud, the evidence was weak sauce and the cases were either dropped by the Trump campaign, or the judge ruled against them. There have been multiple cases where the Trump campaign's lawyers even admitted that they were not citing voter fraud.
The standards of evidence for that website are absolutely cringeworthy. Did you notice that the "evidence" for "FL precinct reports more than 100% voter turnout", which is given the highest level of both significance and admissibility, is quickly debunked JUST BY READING THE SOURCE?!
There is zero evidence of widespread voter fraud. The evidence that is convincing you (probably due to the confirmation bias I mentioned previously), is being looked at by the courts and determined not to be evidence. There are a few isolated cases of voter fraud, but that is to be expected. These isolated cases would not be enough to have a "rigged election".
You are saying that Biden did not have the voter base. What are you basing this on? It sound's like you are judging crowd size. Please correct me, because I don't want to straw man you. If this is the case, can we admit that it is a silly argument considering one guy encourages large gatherings and tells his supporters "Don't let [COVID] dominate your life" and the other discourages gatherings and actively tells his supporters to practice social distancing.
There are still a number of active cases from the Trump campaign and others, trying to contest this election. I recommend following them closely. Read the oral argument transcripts (if available), and review the opinions submitted by the court. This information is available through neutral sources. After each case is won, lost, or dropped; try keeping score and take note how many cases Trump wins due to voter fraud and how many due to technicalities.